Dear Akos, I think you have misunderstood the purpose of generate_xml.py generate_xml.py as far as I understand is to prepare the osm dataset (by default osm.xml) ready for rendering. It fetches the style sheets, symbol information etc and modifies the dataset to create the new osm.xml
The README coming with mapnik also explains its use. Regards. -- Sajjad Anwar | http://geohackers.in | Blog: http://sajjad.in | Twitter: geohacker
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